improve a docstring

Author: ablaom

src/MLJModelRegistryTools.jl

@@ -16,11 +16,12 @@ Module providing tools for managing the MLJ Model Registry. To modify the regist
 
 - Point the `MLJModelRegistryTools` module to the location of the registry itself within
   your MLJModels.jl clone, using `setpath(path_to_registry)`, as in
-  `setpath("MyPkgs/MLJModels.jl/src/registry")`.
+  `setpath("MyPkgs/MLJModels.jl/src/registry")`. To check this worked, try
+  `MLJRegistryTools.get("MLJBase")`, to see the MLJBase.jl models.
 
-- To add or update the metadata associated with a package, run
-  [`update(pkg)`](@ref). Ensure that every model provided by the packge appears as a key
-  in the returned value. Omissions may indicate a bad `load_path`.
+- To add or update the metadata associated with a package, run [`update(pkg)`](@ref), as
+  in `update("MLJTransforms"). Ensure that every model provided by the packge appears as a
+  key in the returned value. Omissions may indicate a bad `load_path`.
 
 - Assuming this is successful, update the metadata for *all* packages in the registry
   by running [`update()`](@ref).